sound/soc/codecs/tas5720.c

   1 /*
   2  * tas5720.c - ALSA SoC Texas Instruments TAS5720 Mono Audio Amplifier
   3  *
   4  * Copyright (C)2015-2016 Texas Instruments Incorporated -  http://www.ti.com
   5  *
   6  * Author: Andreas Dannenberg <dannenberg@ti.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/errno.h>
  20 #include <linux/device.h>
  21 #include <linux/i2c.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/regmap.h>
  24 #include <linux/slab.h>
  25 #include <linux/regulator/consumer.h>
  26 #include <linux/delay.h>
  27
  28 #include <sound/pcm.h>
  29 #include <sound/pcm_params.h>
  30 #include <sound/soc.h>
  31 #include <sound/soc-dapm.h>
  32 #include <sound/tlv.h>
  33
  34 #include "tas5720.h"
  35
  36 /* Define how often to check (and clear) the fault status register (in ms) */
  37 #define TAS5720_FAULT_CHECK_INTERVAL            200
  38
  39 static const char * const tas5720_supply_names[] = {
  40         "dvdd",         /* Digital power supply. Connect to 3.3-V supply. */
  41         "pvdd",         /* Class-D amp and analog power supply (connected). */
  42 };
  43
  44 #define TAS5720_NUM_SUPPLIES    ARRAY_SIZE(tas5720_supply_names)
  45
  46 struct tas5720_data {
  47         struct snd_soc_codec *codec;
  48         struct regmap *regmap;
  49         struct i2c_client *tas5720_client;
  50         struct regulator_bulk_data supplies[TAS5720_NUM_SUPPLIES];
  51         struct delayed_work fault_check_work;
  52         unsigned int last_fault;
  53 };
  54
  55 static int tas5720_hw_params(struct snd_pcm_substream *substream,
  56                              struct snd_pcm_hw_params *params,
  57                              struct snd_soc_dai *dai)
  58 {
  59         struct snd_soc_codec *codec = dai->codec;
  60         unsigned int rate = params_rate(params);
  61         bool ssz_ds;
  62         int ret;
  63
  64         switch (rate) {
  65         case 44100:
  66         case 48000:
  67                 ssz_ds = false;
  68                 break;
  69         case 88200:
  70         case 96000:
  71                 ssz_ds = true;
  72                 break;
  73         default:
  74                 dev_err(codec->dev, "unsupported sample rate: %u\n", rate);
  75                 return -EINVAL;
  76         }
  77
  78         ret = snd_soc_update_bits(codec, TAS5720_DIGITAL_CTRL1_REG,
  79                                   TAS5720_SSZ_DS, ssz_ds);
  80         if (ret < 0) {
  81                 dev_err(codec->dev, "error setting sample rate: %d\n", ret);
  82                 return ret;
  83         }
  84
  85         return 0;
  86 }
  87
  88 static int tas5720_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
  89 {
  90         struct snd_soc_codec *codec = dai->codec;
  91         u8 serial_format;
  92         int ret;
  93
  94         if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
  95                 dev_vdbg(codec->dev, "DAI Format master is not found\n");
  96                 return -EINVAL;
  97         }
  98
  99         switch (fmt & (SND_SOC_DAIFMT_FORMAT_MASK |
 100                        SND_SOC_DAIFMT_INV_MASK)) {
 101         case (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF):
 102                 /* 1st data bit occur one BCLK cycle after the frame sync */
 103                 serial_format = TAS5720_SAIF_I2S;
 104                 break;
 105         case (SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF):
 106                 /*
 107                  * Note that although the TAS5720 does not have a dedicated DSP
 108                  * mode it doesn't care about the LRCLK duty cycle during TDM
 109                  * operation. Therefore we can use the device's I2S mode with
 110                  * its delaying of the 1st data bit to receive DSP_A formatted
 111                  * data. See device datasheet for additional details.
 112                  */
 113                 serial_format = TAS5720_SAIF_I2S;
 114                 break;
 115         case (SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_NB_NF):
 116                 /*
 117                  * Similar to DSP_A, we can use the fact that the TAS5720 does
 118                  * not care about the LRCLK duty cycle during TDM to receive
 119                  * DSP_B formatted data in LEFTJ mode (no delaying of the 1st
 120                  * data bit).
 121                  */
 122                 serial_format = TAS5720_SAIF_LEFTJ;
 123                 break;
 124         case (SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_NB_NF):
 125                 /* No delay after the frame sync */
 126                 serial_format = TAS5720_SAIF_LEFTJ;
 127                 break;
 128         default:
 129                 dev_vdbg(codec->dev, "DAI Format is not found\n");
 130                 return -EINVAL;
 131         }
 132
 133         ret = snd_soc_update_bits(codec, TAS5720_DIGITAL_CTRL1_REG,
 134                                   TAS5720_SAIF_FORMAT_MASK,
 135                                   serial_format);
 136         if (ret < 0) {
 137                 dev_err(codec->dev, "error setting SAIF format: %d\n", ret);
 138                 return ret;
 139         }
 140
 141         return 0;
 142 }
 143
 144 static int tas5720_set_dai_tdm_slot(struct snd_soc_dai *dai,
 145                                     unsigned int tx_mask, unsigned int rx_mask,
 146                                     int slots, int slot_width)
 147 {
 148         struct snd_soc_codec *codec = dai->codec;
 149         unsigned int first_slot;
 150         int ret;
 151
 152         if (!tx_mask) {
 153                 dev_err(codec->dev, "tx masks must not be 0\n");
 154                 return -EINVAL;
 155         }
 156
 157         /*
 158          * Determine the first slot that is being requested. We will only
 159          * use the first slot that is found since the TAS5720 is a mono
 160          * amplifier.
 161          */
 162         first_slot = __ffs(tx_mask);
 163
 164         if (first_slot > 7) {
 165                 dev_err(codec->dev, "slot selection out of bounds (%u)\n",
 166                         first_slot);
 167                 return -EINVAL;
 168         }
 169
 170         /* Enable manual TDM slot selection (instead of I2C ID based) */
 171         ret = snd_soc_update_bits(codec, TAS5720_DIGITAL_CTRL1_REG,
 172                                   TAS5720_TDM_CFG_SRC, TAS5720_TDM_CFG_SRC);
 173         if (ret < 0)
 174                 goto error_snd_soc_update_bits;
 175
 176         /* Configure the TDM slot to process audio from */
 177         ret = snd_soc_update_bits(codec, TAS5720_DIGITAL_CTRL2_REG,
 178                                   TAS5720_TDM_SLOT_SEL_MASK, first_slot);
 179         if (ret < 0)
 180                 goto error_snd_soc_update_bits;
 181
 182         return 0;
 183
 184 error_snd_soc_update_bits:
 185         dev_err(codec->dev, "error configuring TDM mode: %d\n", ret);
 186         return ret;
 187 }
 188
 189 static int tas5720_mute(struct snd_soc_dai *dai, int mute)
 190 {
 191         struct snd_soc_codec *codec = dai->codec;
 192         int ret;
 193
 194         ret = snd_soc_update_bits(codec, TAS5720_DIGITAL_CTRL2_REG,
 195                                   TAS5720_MUTE, mute ? TAS5720_MUTE : 0);
 196         if (ret < 0) {
 197                 dev_err(codec->dev, "error (un-)muting device: %d\n", ret);
 198                 return ret;
 199         }
 200
 201         return 0;
 202 }
 203
 204 static void tas5720_fault_check_work(struct work_struct *work)
 205 {
 206         struct tas5720_data *tas5720 = container_of(work, struct tas5720_data,
 207                         fault_check_work.work);
 208         struct device *dev = tas5720->codec->dev;
 209         unsigned int curr_fault;
 210         int ret;
 211
 212         ret = regmap_read(tas5720->regmap, TAS5720_FAULT_REG, &curr_fault);
 213         if (ret < 0) {
 214                 dev_err(dev, "failed to read FAULT register: %d\n", ret);
 215                 goto out;
 216         }
 217
 218         /* Check/handle all errors except SAIF clock errors */
 219         curr_fault &= TAS5720_OCE | TAS5720_DCE | TAS5720_OTE;
 220
 221         /*
 222          * Only flag errors once for a given occurrence. This is needed as
 223          * the TAS5720 will take time clearing the fault condition internally
 224          * during which we don't want to bombard the system with the same
 225          * error message over and over.
 226          */
 227         if ((curr_fault & TAS5720_OCE) && !(tas5720->last_fault & TAS5720_OCE))
 228                 dev_crit(dev, "experienced an over current hardware fault\n");
 229
 230         if ((curr_fault & TAS5720_DCE) && !(tas5720->last_fault & TAS5720_DCE))
 231                 dev_crit(dev, "experienced a DC detection fault\n");
 232
 233         if ((curr_fault & TAS5720_OTE) && !(tas5720->last_fault & TAS5720_OTE))
 234                 dev_crit(dev, "experienced an over temperature fault\n");
 235
 236         /* Store current fault value so we can detect any changes next time */
 237         tas5720->last_fault = curr_fault;
 238
 239         if (!curr_fault)
 240                 goto out;
 241
 242         /*
 243          * Periodically toggle SDZ (shutdown bit) H->L->H to clear any latching
 244          * faults as long as a fault condition persists. Always going through
 245          * the full sequence no matter the first return value to minimizes
 246          * chances for the device to end up in shutdown mode.
 247          */
 248         ret = regmap_write_bits(tas5720->regmap, TAS5720_POWER_CTRL_REG,
 249                                 TAS5720_SDZ, 0);
 250         if (ret < 0)
 251                 dev_err(dev, "failed to write POWER_CTRL register: %d\n", ret);
 252
 253         ret = regmap_write_bits(tas5720->regmap, TAS5720_POWER_CTRL_REG,
 254                                 TAS5720_SDZ, TAS5720_SDZ);
 255         if (ret < 0)
 256                 dev_err(dev, "failed to write POWER_CTRL register: %d\n", ret);
 257
 258 out:
 259         /* Schedule the next fault check at the specified interval */
 260         schedule_delayed_work(&tas5720->fault_check_work,
 261                               msecs_to_jiffies(TAS5720_FAULT_CHECK_INTERVAL));
 262 }
 263
 264 static int tas5720_codec_probe(struct snd_soc_codec *codec)
 265 {
 266         struct tas5720_data *tas5720 = snd_soc_codec_get_drvdata(codec);
 267         unsigned int device_id;
 268         int ret;
 269
 270         tas5720->codec = codec;
 271
 272         ret = regulator_bulk_enable(ARRAY_SIZE(tas5720->supplies),
 273                                     tas5720->supplies);
 274         if (ret != 0) {
 275                 dev_err(codec->dev, "failed to enable supplies: %d\n", ret);
 276                 return ret;
 277         }
 278
 279         ret = regmap_read(tas5720->regmap, TAS5720_DEVICE_ID_REG, &device_id);
 280         if (ret < 0) {
 281                 dev_err(codec->dev, "failed to read device ID register: %d\n",
 282                         ret);
 283                 goto probe_fail;
 284         }
 285
 286         if (device_id != TAS5720_DEVICE_ID) {
 287                 dev_err(codec->dev, "wrong device ID. expected: %u read: %u\n",
 288                         TAS5720_DEVICE_ID, device_id);
 289                 ret = -ENODEV;
 290                 goto probe_fail;
 291         }
 292
 293         /* Set device to mute */
 294         ret = snd_soc_update_bits(codec, TAS5720_DIGITAL_CTRL2_REG,
 295                                   TAS5720_MUTE, TAS5720_MUTE);
 296         if (ret < 0)
 297                 goto error_snd_soc_update_bits;
 298
 299         /*
 300          * Enter shutdown mode - our default when not playing audio - to
 301          * minimize current consumption. On the TAS5720 there is no real down
 302          * side doing so as all device registers are preserved and the wakeup
 303          * of the codec is rather quick which we do using a dapm widget.
 304          */
 305         ret = snd_soc_update_bits(codec, TAS5720_POWER_CTRL_REG,
 306                                   TAS5720_SDZ, 0);
 307         if (ret < 0)
 308                 goto error_snd_soc_update_bits;
 309
 310         INIT_DELAYED_WORK(&tas5720->fault_check_work, tas5720_fault_check_work);
 311
 312         return 0;
 313
 314 error_snd_soc_update_bits:
 315         dev_err(codec->dev, "error configuring device registers: %d\n", ret);
 316
 317 probe_fail:
 318         regulator_bulk_disable(ARRAY_SIZE(tas5720->supplies),
 319                                tas5720->supplies);
 320         return ret;
 321 }
 322
 323 static int tas5720_codec_remove(struct snd_soc_codec *codec)
 324 {
 325         struct tas5720_data *tas5720 = snd_soc_codec_get_drvdata(codec);
 326         int ret;
 327
 328         cancel_delayed_work_sync(&tas5720->fault_check_work);
 329
 330         ret = regulator_bulk_disable(ARRAY_SIZE(tas5720->supplies),
 331                                      tas5720->supplies);
 332         if (ret < 0)
 333                 dev_err(codec->dev, "failed to disable supplies: %d\n", ret);
 334
 335         return ret;
 336 };
 337
 338 static int tas5720_dac_event(struct snd_soc_dapm_widget *w,
 339                              struct snd_kcontrol *kcontrol, int event)
 340 {
 341         struct snd_soc_codec *codec = snd_soc_dapm_to_codec(w->dapm);
 342         struct tas5720_data *tas5720 = snd_soc_codec_get_drvdata(codec);
 343         int ret;
 344
 345         if (event & SND_SOC_DAPM_POST_PMU) {
 346                 /* Take TAS5720 out of shutdown mode */
 347                 ret = snd_soc_update_bits(codec, TAS5720_POWER_CTRL_REG,
 348                                           TAS5720_SDZ, TAS5720_SDZ);
 349                 if (ret < 0) {
 350                         dev_err(codec->dev, "error waking codec: %d\n", ret);
 351                         return ret;
 352                 }
 353
 354                 /*
 355                  * Observe codec shutdown-to-active time. The datasheet only
 356                  * lists a nominal value however just use-it as-is without
 357                  * additional padding to minimize the delay introduced in
 358                  * starting to play audio (actually there is other setup done
 359                  * by the ASoC framework that will provide additional delays,
 360                  * so we should always be safe).
 361                  */
 362                 msleep(25);
 363
 364                 /* Turn on TAS5720 periodic fault checking/handling */
 365                 tas5720->last_fault = 0;
 366                 schedule_delayed_work(&tas5720->fault_check_work,
 367                                 msecs_to_jiffies(TAS5720_FAULT_CHECK_INTERVAL));
 368         } else if (event & SND_SOC_DAPM_PRE_PMD) {
 369                 /* Disable TAS5720 periodic fault checking/handling */
 370                 cancel_delayed_work_sync(&tas5720->fault_check_work);
 371
 372                 /* Place TAS5720 in shutdown mode to minimize current draw */
 373                 ret = snd_soc_update_bits(codec, TAS5720_POWER_CTRL_REG,
 374                                           TAS5720_SDZ, 0);
 375                 if (ret < 0) {
 376                         dev_err(codec->dev, "error shutting down codec: %d\n",
 377                                 ret);
 378                         return ret;
 379                 }
 380         }
 381
 382         return 0;
 383 }
 384
 385 #ifdef CONFIG_PM
 386 static int tas5720_suspend(struct snd_soc_codec *codec)
 387 {
 388         struct tas5720_data *tas5720 = snd_soc_codec_get_drvdata(codec);
 389         int ret;
 390
 391         regcache_cache_only(tas5720->regmap, true);
 392         regcache_mark_dirty(tas5720->regmap);
 393
 394         ret = regulator_bulk_disable(ARRAY_SIZE(tas5720->supplies),
 395                                      tas5720->supplies);
 396         if (ret < 0)
 397                 dev_err(codec->dev, "failed to disable supplies: %d\n", ret);
 398
 399         return ret;
 400 }
 401
 402 static int tas5720_resume(struct snd_soc_codec *codec)
 403 {
 404         struct tas5720_data *tas5720 = snd_soc_codec_get_drvdata(codec);
 405         int ret;
 406
 407         ret = regulator_bulk_enable(ARRAY_SIZE(tas5720->supplies),
 408                                     tas5720->supplies);
 409         if (ret < 0) {
 410                 dev_err(codec->dev, "failed to enable supplies: %d\n", ret);
 411                 return ret;
 412         }
 413
 414         regcache_cache_only(tas5720->regmap, false);
 415
 416         ret = regcache_sync(tas5720->regmap);
 417         if (ret < 0) {
 418                 dev_err(codec->dev, "failed to sync regcache: %d\n", ret);
 419                 return ret;
 420         }
 421
 422         return 0;
 423 }
 424 #else
 425 #define tas5720_suspend NULL
 426 #define tas5720_resume NULL
 427 #endif
 428
 429 static bool tas5720_is_volatile_reg(struct device *dev, unsigned int reg)
 430 {
 431         switch (reg) {
 432         case TAS5720_DEVICE_ID_REG:
 433         case TAS5720_FAULT_REG:
 434                 return true;
 435         default:
 436                 return false;
 437         }
 438 }
 439
 440 static const struct regmap_config tas5720_regmap_config = {
 441         .reg_bits = 8,
 442         .val_bits = 8,
 443
 444         .max_register = TAS5720_MAX_REG,
 445         .cache_type = REGCACHE_RBTREE,
 446         .volatile_reg = tas5720_is_volatile_reg,
 447 };
 448
 449 /*
 450  * DAC analog gain. There are four discrete values to select from, ranging
 451  * from 19.2 dB to 26.3dB.
 452  */
 453 static const DECLARE_TLV_DB_RANGE(dac_analog_tlv,
 454         0x0, 0x0, TLV_DB_SCALE_ITEM(1920, 0, 0),
 455         0x1, 0x1, TLV_DB_SCALE_ITEM(2070, 0, 0),
 456         0x2, 0x2, TLV_DB_SCALE_ITEM(2350, 0, 0),
 457         0x3, 0x3, TLV_DB_SCALE_ITEM(2630, 0, 0),
 458 );
 459
 460 /*
 461  * DAC digital volumes. From -103.5 to 24 dB in 0.5 dB steps. Note that
 462  * setting the gain below -100 dB (register value <0x7) is effectively a MUTE
 463  * as per device datasheet.
 464  */
 465 static DECLARE_TLV_DB_SCALE(dac_tlv, -10350, 50, 0);
 466
 467 static const struct snd_kcontrol_new tas5720_snd_controls[] = {
 468         SOC_SINGLE_TLV("Speaker Driver Playback Volume",
 469                        TAS5720_VOLUME_CTRL_REG, 0, 0xff, 0, dac_tlv),
 470         SOC_SINGLE_TLV("Speaker Driver Analog Gain", TAS5720_ANALOG_CTRL_REG,
 471                        TAS5720_ANALOG_GAIN_SHIFT, 3, 0, dac_analog_tlv),
 472 };
 473
 474 static const struct snd_soc_dapm_widget tas5720_dapm_widgets[] = {
 475         SND_SOC_DAPM_AIF_IN("DAC IN", "Playback", 0, SND_SOC_NOPM, 0, 0),
 476         SND_SOC_DAPM_DAC_E("DAC", NULL, SND_SOC_NOPM, 0, 0, tas5720_dac_event,
 477                            SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
 478         SND_SOC_DAPM_OUTPUT("OUT")
 479 };
 480
 481 static const struct snd_soc_dapm_route tas5720_audio_map[] = {
 482         { "DAC", NULL, "DAC IN" },
 483         { "OUT", NULL, "DAC" },
 484 };
 485
 486 static struct snd_soc_codec_driver soc_codec_dev_tas5720 = {
 487         .probe = tas5720_codec_probe,
 488         .remove = tas5720_codec_remove,
 489         .suspend = tas5720_suspend,
 490         .resume = tas5720_resume,
 491
 492         .controls = tas5720_snd_controls,
 493         .num_controls = ARRAY_SIZE(tas5720_snd_controls),
 494         .dapm_widgets = tas5720_dapm_widgets,
 495         .num_dapm_widgets = ARRAY_SIZE(tas5720_dapm_widgets),
 496         .dapm_routes = tas5720_audio_map,
 497         .num_dapm_routes = ARRAY_SIZE(tas5720_audio_map),
 498 };
 499
 500 /* PCM rates supported by the TAS5720 driver */
 501 #define TAS5720_RATES   (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |\
 502                          SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 503
 504 /* Formats supported by TAS5720 driver */
 505 #define TAS5720_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S18_3LE |\
 506                          SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE)
 507
 508 static struct snd_soc_dai_ops tas5720_speaker_dai_ops = {
 509         .hw_params      = tas5720_hw_params,
 510         .set_fmt        = tas5720_set_dai_fmt,
 511         .set_tdm_slot   = tas5720_set_dai_tdm_slot,
 512         .digital_mute   = tas5720_mute,
 513 };
 514
 515 /*
 516  * TAS5720 DAI structure
 517  *
 518  * Note that were are advertising .playback.channels_max = 2 despite this being
 519  * a mono amplifier. The reason for that is that some serial ports such as TI's
 520  * McASP module have a minimum number of channels (2) that they can output.
 521  * Advertising more channels than we have will allow us to interface with such
 522  * a serial port without really any negative side effects as the TAS5720 will
 523  * simply ignore any extra channel(s) asides from the one channel that is
 524  * configured to be played back.
 525  */
 526 static struct snd_soc_dai_driver tas5720_dai[] = {
 527         {
 528                 .name = "tas5720-amplifier",
 529                 .playback = {
 530                         .stream_name = "Playback",
 531                         .channels_min = 1,
 532                         .channels_max = 2,
 533                         .rates = TAS5720_RATES,
 534                         .formats = TAS5720_FORMATS,
 535                 },
 536                 .ops = &tas5720_speaker_dai_ops,
 537         },
 538 };
 539
 540 static int tas5720_probe(struct i2c_client *client,
 541                          const struct i2c_device_id *id)
 542 {
 543         struct device *dev = &client->dev;
 544         struct tas5720_data *data;
 545         int ret;
 546         int i;
 547
 548         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 549         if (!data)
 550                 return -ENOMEM;
 551
 552         data->tas5720_client = client;
 553         data->regmap = devm_regmap_init_i2c(client, &tas5720_regmap_config);
 554         if (IS_ERR(data->regmap)) {
 555                 ret = PTR_ERR(data->regmap);
 556                 dev_err(dev, "failed to allocate register map: %d\n", ret);
 557                 return ret;
 558         }
 559
 560         for (i = 0; i < ARRAY_SIZE(data->supplies); i++)
 561                 data->supplies[i].supply = tas5720_supply_names[i];
 562
 563         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->supplies),
 564                                       data->supplies);
 565         if (ret != 0) {
 566                 dev_err(dev, "failed to request supplies: %d\n", ret);
 567                 return ret;
 568         }
 569
 570         dev_set_drvdata(dev, data);
 571
 572         ret = snd_soc_register_codec(&client->dev,
 573                                      &soc_codec_dev_tas5720,
 574                                      tas5720_dai, ARRAY_SIZE(tas5720_dai));
 575         if (ret < 0) {
 576                 dev_err(dev, "failed to register codec: %d\n", ret);
 577                 return ret;
 578         }
 579
 580         return 0;
 581 }
 582
 583 static int tas5720_remove(struct i2c_client *client)
 584 {
 585         struct device *dev = &client->dev;
 586
 587         snd_soc_unregister_codec(dev);
 588
 589         return 0;
 590 }
 591
 592 static const struct i2c_device_id tas5720_id[] = {
 593         { "tas5720", 0 },
 594         { }
 595 };
 596 MODULE_DEVICE_TABLE(i2c, tas5720_id);
 597
 598 #if IS_ENABLED(CONFIG_OF)
 599 static const struct of_device_id tas5720_of_match[] = {
 600         { .compatible = "ti,tas5720", },
 601         { },
 602 };
 603 MODULE_DEVICE_TABLE(of, tas5720_of_match);
 604 #endif
 605
 606 static struct i2c_driver tas5720_i2c_driver = {
 607         .driver = {
 608                 .name = "tas5720",
 609                 .of_match_table = of_match_ptr(tas5720_of_match),
 610         },
 611         .probe = tas5720_probe,
 612         .remove = tas5720_remove,
 613         .id_table = tas5720_id,
 614 };
 615
 616 module_i2c_driver(tas5720_i2c_driver);
 617
 618 MODULE_AUTHOR("Andreas Dannenberg <dannenberg@ti.com>");
 619 MODULE_DESCRIPTION("TAS5720 Audio amplifier driver");
 620 MODULE_LICENSE("GPL");